NGC 281 in the constellation of Cassiopeia


NGC 281 is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590, the multiple star HD 5005, and several Bok globules. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

The nebula was discovered in August 1883 by E. E. Barnard, who described it as “a large faint nebula, very diffuse.” The multiple star HD 5005, also called \beta1, was discovered by S. W. Burnham. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc. There has been no appreciable change in this quintuple system since the first measurements were made in 1875.

Imaging telescopes or lenses: GSO RC8
Imaging cameras: Canon EOS 450D / Digital Rebel XSi / Kiss X2
Mounts: Sky-Watcher NEQ6
Guiding telescopes or lenses: Sky-Watcher Equinox 80
Guiding cameras: lacerta mgen2
Focal reducers: AP CCDT67
Software: photoshop, PixInsight, Iris
Accessories: Astronomik ha filter 12nm (EOS clip type), astronomik CLS filter (EOS Clip)
Dates: July 9, 2012, Oct. 30, 2012
Astronomik Clip CLS: 35×300″ ISO400 bin 1×1
Astronomik H-alpha 12nm: 10×300″ ISO400 bin 1×1
Integration: 3.8 hours
Darks: ~22
Flats: ~38
Bias: ~35

Author:  Philippe Mingasson
AstroPhotography of the day by SPONLI 29 July 2014